KEYENCE Visual KV Series - Manual (Page 250)

4.4 Expanded Functions of High-speed Counters
3-226
Visual KV
Series
4
Chapter 4 High-speed Counters
0 9999
2008
0003
0005
CTH0
RES
0007
EI
2406
SET
2112
SET
2114
RES
2113
SET
2002
0001
HSP
0004 0002
END
0006
INT
CTC1
0010
0011
RETI
0009
ENDH
#00010
T000
1)
0500
RES 5)
2)
HSP
0006
2002 CTH0
0004 0004
0500 T000
3)
0500
SET 6)
2002
0008
#10000
CTC1 4)
Sets high-speed counter in
double (x2) multiplication mode.
Sets ring
counter. Automatic reset
of high-speed
counter
4.4.5 Applications of Ring Counters
When using a 16-bit high-speed counter
The following is a ladder program that uses the ring counter of a 16-bit high-speed
counter with the preset value of "10000".
1) When the power is turned on, an EI instruction enables interrupts. Sets high-
speed counter CTH0 in double (x2) multiplication mode, CTH0 as a ring counter,
and the high-speed counter automatic reset function at counting up. Resets the
high-speed counter.
2) Sets the input time constant for input relays 0004 and 0006 to 10 µs.
3) Counts 2-phase pulses of input relays 0004 and 0006 at CTH0.
4) Sets the preset value of high-speed counter comparator CTC1 to "10000".
5) Output relay 0500 turns ON for 1 second and then turns OFF.
6) When CTC1 turns ON, an interrupt is executed. Output relay 0500 turns ON.
KVNKA Chap 04_1.p65 08.3.11, 0:06 PM 226